Furnace for driers.



l Patented July 2, 190|. W. H. PRINZ.`

FURNCE FOR. DRIERS.

l (Application led May 31, 1900.) Y (nu new.) I 2 sheets-sheet 2.

- I l A j if.

N Yi

UNITED STATES PATENT UFFICI-3ll WILLIAM II. vPRINZ, OF AUSTIN, ILLINOIS,ASSIGNOR To THE SALADIN l:PNIIIUMATIC MALTINGr CONSTRUCTION CO., OFCHICAGO, ILLINOIS.

FURNAOE FOR DRIERS.

SPECIFICATION forming part of Letters Patent No. 677,697, dated July 2,1901.

Original application tiled August I5, 1898, Serial No. 688,622. Dividedand this application filed May 8l, 1900. Serial No. 18,593. (No model.)l

T0 all whom it may concern.-

Be it known that 1WILLIAM H.l PRINZ, a citizen of the United States,residing at Austin, in the county of Cook and State of Illinois,

have invented certain new and useful Improvements in Furnaces forDriers; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

My invention relates to a novel construction in a furnace for driers,the object being to provide a furnace in which the products ofcombustion are thoroughly and intimately mixed With a large volume offresh air, thereby not only reducing the temperature, but likewiseproviding a large volume of Warm dry air, whereby the best results indrying grain, the., are produced; and it consists in the features ofconstruction and combinations of parts hereinafter fully described andclaimed.

In the accompanying drawings, illustrating my invention, Figure lis avertical transverse section of a furnace constructed in accordance withmyinvention, taken on the line 1 l of Fig. 3. Fig. 2 is an end elevationof same. Figs. 3 and l are vertical longitudinal sections on the lines 33 and 4. 4, respectively, of Fig. 1.

This application is a division of my application for Letters Patent foran apparatus for drying malt, filed August l5, 1898, Serial No. 688,622.

In drying grain and the like the best resuits are produced by using alarge volume of Warm air of practically uniform temperature, as suchlarge volume of Warm air is obviously capable of absorbing a very muchVlarger quantity of moisture than a limited volume of very much hotterair. Another advantage of the use of a larger volume of Warm air asagainst a lesser volume of hot air is that it cannot in j uriously aectmalt or grain in the manner of hot air, which is apt, Without theexercise of greatcare, to roast the malt or grain. Another disadvantageof the use of hot air is the fact that the temperature of the grain isgreatly increased and a slight draft of cold air is apt to chill it inparts, thereby rendering it acidulous. Heretofore it has been verydifficult to provide a large volume of Warm air of a practically uniform'l temperature throughout, for the reason that the fresh admitted to mixwith the hot air was admitted at points more Or less remote from thefurnace, and' thereby a number of currents of greatly-varyingtemperatures were produced which acted injuriously on the malt or grain.Then, again, in the furnaces heretofore used the hot gases were admitteddirectly to the drying-chamber and carried a large quantity of fineashes, which mixed With the grain.

My present device is designed to overcome the above-named disadvantagesby intimately commingling the hot and cold air entering thedrying-chamber, so that the temperature throughout the latter is"maintained uniformly, and, further, by providing passages to cause theproducts of combustion to take a zigzag course to free the latter of thefine ashes usually carried thereby.

To these and other ends my device consists of a firing-chamber A,provided midway between its top and bottom with a grate B and having acovering C. The said firing-chamber A is open at both ends and isprovided with hinged doors D, E, and F at said ends. In the side Wallsof said firing-chamber A, above said grate B, is a plurality of openingsG, leading to covered dovvndraft mixingchambers I-I ou each side of saidfiring-chamber A. In the end Walls of said mixing-chambers Hare openings I, in which movable slats or blinds J are mounted, which can beadjusted to close said openings I or to admit air thereto. In the lowerends of the Walls K, separating said mixing-chambers H and themixing-chambers L beyond the same, are openings M, connecting saidmixing-chambers H and L. The latter are open at their upper ends anddischarge into the dryingchamber above. (Not shown.) In the end Walls ofsaid mixing-chambers L are openings N, likewise controlled by blinds O.

The operation of my furnace is very simple. A hard-coal fire is builtupon the grate B and is controlled by means of the doors D, E, and F.The products of combustion and hot air then pass through themixing-chamber I-I and draw in fresh air through said blinds J, whichintermingles With said hot gases. The latter carry fine ashes with them,

and lthese fine ashes settle in the bottom of said mixing-chamberH,being deposited when said gases turn through the openings M intomixing-chamber L. Thence said hot gases, partially mixed with fresh air,pass upwardly through the chambers L and during their passage arefurther mixed with fresh air admitted through said blinds O. Saidmixingchambers H and L are narrow and flue-like, this being essential toproduce an ultimate mixture of the hot gases with fresh air, and hencewhen the mixed' gases are discharged their temperature throughout ispractically uniform. also be readily controlled by adjusting the blindsand the doors of the firing-chamber to admit varying quantities of freshair at various points, thus enabling the operator to secure any resulthe may desire.

It is an essential feature of my invention that the mixing-chambers beso proportioned to the drying-chamber that the gases must pass throughsaid mixing-chambers at very high speed, because in this Way only canan.

intimate mixture of the products of combustion and fresh air beaccomplished.

I claim as my invention- 1. A device of the kind specified, comprising acovered comb ustion-chamber, a covered mixing-chamber at the side ofsaid combustion-chamber and opening thereto adjacent the top of each, asecond mixing-chamber at the opposite side and substantially coextensivewith said first mixing-chamber, and open The temperature of said gasescan l thereto at the bottom of each, andair-flues entering eachmixing-chamber on alevel with its induction-flue.

2. A device of the kind specified, comprisingacombustion-chamber coveredby an arch, a'miXing-chamber having a discharge-opening at the top, anintermediate mixing-chamber located between the combustion-chamber andthe rst-named mixing-chamber, a flue connecting said combustion-chamberand said intermediate mixing-chamber at the top of each, a fineconnecting said mixing-chambers at the bottom of each,v and air-finesentering the top of said intermediate and` bottom of said first-namedmixing-chamber.

3. A device of the kind specified, comprising a combustion-chambercovered by an arch and provided with discharge-fines adjacent the top, adowndraft mixing-due on each side of said combustion-chamber,air-valvesin said mixing-fines, a mixing-flue beyond each of said doWndraft-iiues,open at the top and communicating with the latter at the bottom of each,and air-valves in said last-named mixing-fines, whereby the hot air andproducts of combustion from said `combustion-chamber are divided andmixed with cool air and discharged at divergent points.

In testimony whereof I affix my signature in presence of two witnesses.

- W'ILLIAM H. PRINZ.

Witnesses:

E. F. WILSON, RUDOLPH WM. Lorz.

